A little of topic but need some help!

That truck won't throw a tranny code, I don't believe.

The only thing that controls the transmission is the ECM and the manual shift shaft; those other gizmos all input to the ECM for it to use in it's calculations.

Have you looked at your fuel filter? Sounds like it is maybe getting plugged up to me. Are your up-shifts just a tad late too? Engine maybe a little weak in the knees too?

If you need more help, post back and I'll try to walk you thru the trouble tree,

Allan

Yes Sir, that's for sure; the good old days are just plain gone, I guess. :>(

But then on the other hand, when the iron was switched over to electronic control, the fuel/air ratio was accurately controlled and the overdriven, locked-converter type transmissions dropped that engine speed by 27%, it sure put an end to all those burnt valves, it cut the bad alternator bearings in half and it really stopped those engines from being completely wobbled out at about 50,000 miles too.

From my end tho, those GM trannys sure made me a lot of money over the years. I could never understand why GM bull-headily insisted on using those "lipped" seals, which would fail like clockwork. You could almost write it on your calendar when it would be time to trade again.

Ol' Henry Ford had it figured out a long time ago when he plugged in those square-cut seals; 'cause they just plain last a lot longer. :>)

Hope you get your truck goin',

Allan

While like the other boys have said, it is true that a lot of things can be causing your difficulty and while I'm not there and I cannot 'feel' what your truck is doing, I've just gotta tell ya though, that a clogged fuel filter is the biggest headache an electric transmission has.

In order to obtain (and maintain) any given speed, the operator must hold the accelerator pedal further down than he normally would otherwise have to. This action, of course, will cause the ECM to see that ‘odd’ signal from the TPS and interprets it as though the operator wants 'more acceleration'.

Since the signal coming from the speed sensor is indicating a slower speed than what normally corresponds to the ECM’s preset parameters for that particular gear, that particular TPS signal and at that particular speed, the ECM will then drop the transmission down a gear trying to “comply” to this falsely interpreted demand.

So I guess what I am trying to say, is that the very first place one would look for electronic transmission trouble, other than a “no move” symptom, is that darned fuel filter. This is especially true for transmission shift & drivability concerns.

I’m just tryin’ to help, :>)

Allan